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AGI GGH-8371 Installation, Operation, And Parts Manual

Downstream centrifugal fan heater
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Downstream Centrifugal Fan
Heater
LP and NG-Fired Heater
Installation, Operation, and Parts Manual
This manual applies to:
GGH-8371 and GGH-8372
Read this manual before using product. Failure to
follow instructions and safety precautions can
result in serious injury, death, or property
damage. Keep manual for future reference.
INSTALLATION AND WIRING MUST BE IN
ACCORDANCE WITH CEC, NEC, AND
LOCAL ELECTRICAL CODES
Part Number: GNA-1435 R1
Revised: January 2023
Original Instructions

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  • Page 1 Downstream Centrifugal Fan Heater LP and NG-Fired Heater Installation, Operation, and Parts Manual This manual applies to: GGH-8371 and GGH-8372 INSTALLATION AND WIRING MUST BE IN ACCORDANCE WITH CEC, NEC, AND LOCAL ELECTRICAL CODES Read this manual before using product. Failure to...
  • Page 3 This product has been designed and manufactured to meet general engineering standards. Other local regulations may apply and must be followed by the operator. All personnel must be trained in the correct operational and safety procedures for this product. Use the sign-off sheet below to record initial and periodic reviews of this manual with all personnel.
  • Page 4 New in this Manual The information below summarizes the changes to this manual since the last revision in April 2016. Description Section New heater model Section 2.9.2 – Safety Decal Locations and Details on page 13 New heater model added Section 3.1 –...

  • Page 5: Table Of Contents

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER CONTENTS 1. Introduction ............................7 1.1 Product Information........................7 1.2 Intended Use ..........................8 1.2.1 Misuse ........................8 2. Safety............................... 9 2.1 Safety Alert Symbol and Signal Words..................9 2.2 General Safety Information....................... 9 2.3 Heater Safety...........................
  • Page 6 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 6.3 Visually Inspect the Downstream Heater ................36 6.4 Annual Maintenance ....................... 36 6.5 Fuel Train and Supply Gas Leak Check..................36 6.6 Pressure Regulator Maintenance.................... 37 6.7 Electrical Maintenance......................37 6.8 Access Door ..........................

  • Page 7: Introduction

    Keep this manual handy for frequent reference and to review with new personnel. A sign-off form is provided on the inside front cover for your convenience. If any information in this manual is not understood or if you need additional information, please contact AGI or your representative for assistance.

  • Page 8: Intended Use

    1. INTRODUCTION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 1.2. Intended Use The downstream heater is intended for use as listed below and described throughout this manual. Use in any other way is considered contrary to the intended use and is not covered by the warranty. Intended use for the downstream heater •...

  • Page 9: Safety

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 2. SAFETY 2. Safety 2.1. Safety Alert Symbol and Signal Words This safety alert symbol indicates important safety messages in this manual. When you see this symbol, be alert to the possibility of injury or death, carefully read the message that follows, and inform others.

  • Page 10: Heater Safety

    2. SAFETY DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 2.3. Heater Safety Fire and explosion hazards, as well as carbon monoxide poisoning could occur if the heater is misused. To avoid serious injury or death: • Shut off and lock out or disconnect power and close valve at gas source before inspecting or servicing the heater, or when not in use.

  • Page 11: Grain Bin Fires

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 2. SAFETY 2.5. Grain Bin Fires To Prevent Fires: • Use all equipment (fan, heater, air system and bin) as it is intended to be used. • Ventilate, purge all contaminates, and allow burner, and drying areas to cool inside the heater, in the heater area and the grain bin before any persons enter these areas.

  • Page 12: Drives And Lockout/Tagout Safety

    2. SAFETY DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 2.6. Drives and Lockout/Tagout Safety Inspect the power source(s) before using and know how to shut down in an emergency. Whenever you service or adjust your equipment, make sure you shut down your power WARNING source and gas supply and follow lockout and tagout procedures to prevent inadvertent start-up and hazardous energy release.

  • Page 13: Decal Installation/Replacement

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 2. SAFETY • Replace safety decals that are missing or have become illegible. See decal location figures that follow. • Replaced parts must display the same decal(s) as the original part. •...
  • Page 14 2. SAFETY DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 1. Safety Decals Part Number Description 601-1995 WARNING (Control panel cover, outside) ELECTROCUTION HAZARD To prevent serious injury or death: • Only qualified personnel should service electrical components. •...
  • Page 15 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 2. SAFETY Table 1 Safety Decals (continued) Part Number Description 601-3582 WARNING AVERTISSEMENT (Heater housing) If the information in the manual is not followed exactly, a fire Si les informations données dans le mode d’emploi ne sont pas respectées à...

  • Page 16: Features

    Read this section to familiarize yourself with the basic component names and functions of the downstream heater. 3.1. Downstream Heater Note AGI Downstream Centrifugal Fan Heaters are sized according to the centrifugal fan’s power source and the motor HP rating. GNA-1435 R1...
  • Page 17 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 3. FEATURES GNA-1435 R1...

  • Page 18: Burner Assembly

    3. FEATURES DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 3.2. Burner Assembly HARNESS: CONTROL BOX FUEL TRAIN FLEXIBLE HARNESS PROTECTION IGNITER PLUG FLAME PROBE BURNER HOUSING NOTE: The burner ports (holes) are on the opposite side of this pipe. GNA-1435 R1...

  • Page 19: Control Box Assembly

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 3. FEATURES 3.3. Control Box Assembly Important The power “IN” to the heater control box comes from the centrifugal fan - this must be wired such that there is no power to the heater unless the fan is running. 1.5A FUSE ON / OFF SWITCH...

  • Page 20: Installation

    Report missing or damaged parts immediately to ensure that proper credit is received from AGI or your representative, and to ensure that any missing parts can be shipped quickly to avoid holding up the assembly process.

  • Page 21: Electrical Connection

    • The heater power source must be electrically interlocked to the fan to ensure operation only when the fan is running. • AGI recommends that all fan/heaters are connected to a ground rod. Check previously installed units for proper grounding.

  • Page 22: Field And Control Wiring Entry

    4. INSTALLATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 4.4.1 Field and Control Wiring Entry Access to field and control wiring is shown in the following illustration. Figure 2. Control Box entry location CONTROL BOX ASSEMBLY 4.4.2 Disconnect A properly sized, separate, lockout type disconnect for each fan should be mounted on the main power panel, especially if the fan unit is not entirely visible from the main power panel.

  • Page 23: Grounding

    4. INSTALLATION 4.4.4 Grounding • AGI recommends that fan and heater be connected to a ground rod that is no further than 8 feet away. • The ground rod should be connected with a minimum 6 AWG solid, bare copper wire.

  • Page 24: Fuel Supply

    4.5. Fuel Supply Important • AGI suggests hiring a professional to plan, set up, and connect the chosen fuel supply. The system must include an emergency shut-off valve. • Refer to the fan/heater rating decal for determining the minimum gas supply pressure for obtaining the maximum gas capacity for which this fan/heater is specified.
  • Page 25 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 4. INSTALLATION Figure 3. Example Supply Tank Liquid To Heater Table 2. Line Sizing Chart — Liquid Propane (LP) Gas Liquid — Copper Tubing Line Length Copper Tubing — Type K Liquid Propane Flow Rate Outside Diameter 3/8”...
  • Page 26 4. INSTALLATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 3. Line Sizing Chart — Liquid Propane (LP) Gas Liquid — Schedule 80 Pipe Line Length Schedule 80 Pipe Liquid Propane Flow Rate 1–1/4” 1/4” (6.4 mm) 3/8” (9.5 mm) 1/2”...

  • Page 27: Install The Heater

    Important • Use the appropriate adapter plates to connect fans and heaters to transitions. AGI can provide adapter plates - contact your dealer. • Do not weld on the heater, fan, or transition flanges, welding distortions can cause vibrations.
  • Page 28 4. INSTALLATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Figure 5. Modulating Valve Installation Example Figure 6. Fan, Heater, Transition Installation GNA-1435 R1...

  • Page 29: Connect The Gas Supply

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 4. INSTALLATION 4.7. Connect the Gas Supply This procedure describes how to connect propane or natural gas to the heater, test for piping system pressure, and test for gas leaks. Connecting the Gas Hose 1.

  • Page 30: Operation

    5. OPERATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 5. Operation Before continuing, ensure you have completely read and understood this manual’s Safety section, in addition to the safety information in the section(s) below. 5.1. Operation Safety • Ensure the heater is connected to the appropriate gas supply, and correctly sized orifice is installed.

  • Page 31: Start-Up And Operation

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 5. OPERATION 5.3. Start-Up and Operation Important • During initial heater startup, qualified gas service personnel must perform a gas leak check to verify the gas tightness of the heater’s components and piping under normal operating conditions. •...

  • Page 32: Hi Lo Operation

    5. OPERATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 7. As regulator is adjusted ensure that the gas pressure on the gage does NOT exceed the values listed below: GGH-8371 LP Gas 15 PSI GGH-8372 LP Gas 12 PSI...

  • Page 33: Modulating Valve Operation

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 5. OPERATION 9. Once cycling time has been established, verify plenum temperature when heater is running at hi fire, and the temperature of the heater at lo fire, to the settings on temperature controller. 5.3.4 Modulating Valve Operation 1.

  • Page 34: Storage Instructions

    5. OPERATION DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 5.5. Storage Instructions If the heater is not to be used for an extended period of time: 1. Close the propane/natural gas valve at tank/hydrant. 2. Allow the heater unit to run until the flame burns out. This purges the gas out of the heater plumbing and supply lines.

  • Page 35: Maintenance

    • After maintenance is complete, replace all guards, service doors, and/or covers. • Use only genuine AGI replacement parts or equivalent. Use of unauthorized parts will void warranty. If in doubt, contact AGI or your local dealer.

  • Page 36: Visually Inspect The Downstream Heater

    6. MAINTENANCE DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 6.3. Visually Inspect the Downstream Heater Check the following during a visual inspection: 1. Ensure all guards are in place and in good working order. 2. Examine the downstream heater for damage or unusual wear. 3.

  • Page 37: Pressure Regulator Maintenance

    • Tampering with the regulator voids the warranty. • Regulator replacement must be performed at the factory or be performed by a qualified gas technician approved by AGI. Death or serious injury due to fire or explosion could result from an improperly connected pressure regulator.

  • Page 38: Troubleshooting

    You may also contact an AGI product specialist at 1–800–565–2840. Before you contact them, please have this operation manual and the serial number from your machine ready.

  • Page 39: Heater Diagnostic

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 7. TROUBLESHOOTING 7.2. Heater Diagnostic 1. Check the 3 amp fuse. a. Replace if necessary 2. With switch in “on” position, check for voltage across the toggle switch. If no voltage is present at the downstream side of the switch, then replace the switch.

  • Page 40: Symptoms/Causes/Solutions

    7. TROUBLESHOOTING DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 7.3. Symptoms/Causes/Solutions Never check for a spark without first shutting off the fuel supply and purging all fuel from the system. Purge the fuel system by shutting off the fuel supply, starting the fan, and cycling the burner ignition sequence 2 to 3 times.
  • Page 41 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 7. TROUBLESHOOTING Table 4 Symptoms, Causes and Solutions (continued) Symptoms Check Possible Cause Solution Vaporizer tripping Vaporizer location Adjust vaporizer away from flame; high limit and gas pressure reduce gas pressure Igniter gap Incorrect gap Set gap to 0.07”...
  • Page 42 7. TROUBLESHOOTING DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 4 Symptoms, Causes and Solutions (continued) Symptoms Check Possible Cause Solution Correct low voltage issue. Faulty starter Replace starter capacitor Motor capacitor Centrifugal switch (in Faulty switch Repair or replace the motor fan motor) Re-attach cover or Re-attach the cover so it does not...

  • Page 43: Appendix

    • All heater models include an ON/OFF switch and may be equipped with an optional High-Low (HL) switch or Modulating Valve (MV) burner control. • AGI recommends that a thermometer be mounted near the burner control probe under the bin to ensure that the burner controls are operating at the desired setting.
  • Page 44 • The burner control, whether thermostat, humidistat, or modulating valve, determines the temperature under the bin. • AGI also recommends that a thermometer be mounted near the burner control probe under the bin to help ensure that burner controls are operating at the desired setting.
  • Page 45 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Table 6. BTUS per Guage Pressure (PSI) - DSH Propane Model DSH1 Orifice 145,681 200,000 291,362 356,844 412,048 460,684 504,654 545,089 0.125 447,262 632,524 894,525 1,095,565 1,265,050 1,414,368 1,549,363 1,673,503 0.219 Orifice...
  • Page 46 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 7. GUAGE PRESSURE (PSI) REQUIRED TO MAINTAIN TEMPERATURE RISE (Approximate) PROPANE Orifice Temperature Rise (Deg F) .125 2" .219 .125 10 HP 4" DSH1 .219 .125 6" .219 .125 2"...
  • Page 47 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Table 7 GUAGE PRESSURE (PSI) REQUIRED TO MAINTAIN TEMPERATURE RISE (Approximate) PROPANE (continued) Orifice Temperature Rise (Deg F) .219 2" .313 .219 4" .313 25HP DSH2 .219 6" .313 .219 8"...
  • Page 48 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 7 GUAGE PRESSURE (PSI) REQUIRED TO MAINTAIN TEMPERATURE RISE (Approximate) PROPANE (continued) Orifice Temperature Rise (Deg F) .219 2" .313 .219 4" .313 .219 6" .313 50 HP DSH2 .219 8"...
  • Page 49 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Table 8. BTUS PER Guage Pressure (PSI) - DSH Natural Gas Model DSH1 Orifice 240,000 267,646 378,509 463,577 535,293 .219 733,626 820,218 1,159,965 1,420,661 1,640,438 .313 Orifice 598,476 655,597 708,126 757,018 766,423...
  • Page 50 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 9. Guage Pressure (PSI) Required to Maintain Temperature Rise (Approximate) Natural Gas Orifice Temperature Rise (Deg F) .219 2" .313 .219 10 HP 4" DSH1 .313 .219 6" .313 .219 2"...
  • Page 51 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Table 9 Guage Pressure (PSI) Required to Maintain Temperature Rise (Approximate) Natural Gas (continued) .375 2" .438 .375 4" .438 .375 25 HP 6" DSH2 .438 .375 8" .438 .375 9"...

  • Page 52: Fenwal-Related Issues

    8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Table 9 Guage Pressure (PSI) Required to Maintain Temperature Rise (Approximate) Natural Gas (continued) .375 2" .438 .375 4" .438 .375 6" .438 50 HP DSH2 .375 8" .438 .375 10"...
  • Page 53 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Igniter Malfunction 1. Check for a good ground between terminal B on the Fenwal module and the ground. 2. Make sure the spark plug gap is set at 0.07” (1.78 mm). 3.
  • Page 54 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Figure 7. Control Box LED indicator Control board red LED indicator light CONTROL ASSEMBLY 2. FLAME FAILURE - RE-IGNITION MODE – If the established flame signal is lost while the burner is operating, the control will respond within 0.8 seconds by immediately energizing the H.V.
  • Page 55 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Fenwal Troubleshooting Table 10. Troubleshooting Guide Symptom Recommended Actions Miswired No 120 VAC at L1 Control does not start Fuse or circuit breaker fault Faulty control, check LED for fault codes Miswired Faulty thermostat, no voltage at terminal L1 Thermostat on —...

  • Page 56: V50 Modulating Valves - Johnson Controls

    8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8.3. V50 Modulating Valves — Johnson Controls INSTALLATION AND OPERATION INSTRUCTIONS SERIES V50 FORM 996-61-4 Application These valves control the flow of gas on natural or liquid propane gas-fired, outdoor crop dryers to maintain desired drying air temperature.
  • Page 57 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX On direct- or indirect-fired vaporizer systems in which hot liquid propane gas is flowing through the valve, install the valve with the bellows pointing down. This allows the temperature-sensing element to perform properly. In vapor withdrawal systems, the gas flowing through the valve is cooler than the sensing bulb and the valve mounting position is not as important.
  • Page 58 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Figure 12. Internal Bypass Within the Valve Figure 13. Typical Piping for the V50 Valve Note • Replace this plug with Orifice Plug when bypass is required. • Orifice plug - See Table for orifice sizes in PLG14A-600R Kit Adjustment Adjust the valve close-off point by turning the “T”...

  • Page 59: Electrical Schematics

    DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX 8.4. Electrical Schematics Important When installing new wires, always replace wires with original type and/or an equivalent wire type. GNA-1435 R1...
  • Page 60 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER GNA-1435 R1...
  • Page 61 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX GNA-1435 R1...

  • Page 62: Parts Lists

    8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8.5. Parts Lists Downstream Heater Parts Figure 14. Model GGH-8371LO Table 14. Model GGH-8371LO Parts Description Item Part Number — VALVE TRAIN GNH-1484 PLUG ORIFICE .438 GNH-1485 PLUG ORIFICE .375 GNH-1486 PLUG ORIFICE .313 GNH-1487...
  • Page 63 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Table 14 Model GGH-8371LO Parts (continued) 507-1294 SWITCH TOGGLE ON-OFF 507-1293 TOGGLE SWITCH BOOT 510-1120 FUSE HOLDER 510-1408 1.5 A FUSE 510-1539 3 A FUSE 524-1538 HI LIMIT 200 DEG 526-1193 DIRECT SPARK IGNITION MODULE 35-705706-115 507-1139...
  • Page 64 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Valve Train Figure 15. DSH 1/2 Valve Train LP ON-OFF (Models GGH-8371LO and GGH-8372LO) Table 15. DSH 1/2 Valve Train LP ON-OFF Parts (Models GGH-8371LO and GGH-8372LO) Description Quantity Item Part Number 1/2 X 1/2 HI PRESS REGULATOR 1-30 PSI...
  • Page 65 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Figure 16. DSH 1/2 Valve Train LP HI-LO (Models GGH-8371LH and GGH-8372LH) Table 16. DSH 1/2 Valve Train LP HI-LO Parts (Models GGH-8371LH and GGH-8372LH) Description Quantity Item Part Number 1/2 X 1/2 HI PRESS REGULATOR 1-30 PSI 527-2605 527-4836...
  • Page 66 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Figure 17. DSH 1/2 Valve Train LP MOD (Models GGH-8371LM and GGH-8372LM) Table 17. DSH 1/2 Valve Train LP MOD Parts (Models GGH-8371LM and GGH-8372LM) Description Quantity Item Part Number 527-2605 1/2 X 1/2 HI PRESS REGULATOR 1-30 PSI 527-4836...
  • Page 67 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Figure 18. DSH 1/2 Valve Train NG ON-OFF (Models GGH-8371NO and GGH-8372NO) Table 18. DSH 1/2 Valve Train NG ON-OFF Parts (Models GGH-8371NO and GGH-8372NO) Description Quantity Item Part Number 527-4843 RELIEF VALVE 1”...
  • Page 68 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Figure 19. DSH 1/2 Valve Train NG HI-LO (Models GGH-8371NH and GGH-8372NH) 11 16 Table 19. DSH 1/2 Valve Train NG HI-LO Parts (Models GGH-8371NH and GGH-8372NH) Description Quantity Item Part Number 527-4843...
  • Page 69 DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER 8. APPENDIX Figure 20. DSH 1/2 Valve Train NG MOD (Models GGH-8371NM and GGH-8372NM) Table 20. DSH 1/2 Valve Train NG MOD Parts (Models GGH-8371NM and GGH-8372NM) Description Quantity Item Part Number 527-4843 RELIEF VALVE 1”...
  • Page 70 8. APPENDIX DOWNSTREAM CENTRIFUGAL FAN HEATER – LP AND NG-FIRED HEATER Fuel Train — Liquid Propane Figure 21. DSH 1/2 Fuel Train LP (Models GGH-8371LH/LM/LO and GGH-8372LH/LM/LO) Table 21. DSH 1/2 Fuel Train LP Parts (Models GGH-8371LH/LM/LO and GGH-8372LH/LM/LO) Description Quantity Item Part Number...

  • Page 71: Warranty

    9. WARRANTY 9. Warranty Except as expressly provided in this agreement, AGI (hereinafter called the Manufacturer) excludes all express or implied warranties, conditions, and obligations of the Manufacturer, whether statutory or otherwise, concerning the quality of the units or their fitness for any purpose.
  • Page 72 AGI is a leading provider of equipment solutions for agriculture bulk commodities including seed, fertilizer, grain, and feed systems with a growing platform in providing equipment and solutions for food processing facilities. AGI has manufacturing facilities in Canada, the United States, the United Kingdom, Brazil, South Africa, India and Italy and distributes its products globally.

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Ggh-8372

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